-
Categories
-
Platforms
-
Content
If there is an LM723 regulator, it's a good suspect.
Also its model number as they go back 30 + years. . . . .
73's de Edd
73's de Edd
Sir BrianBro . . . . . . .
Since that power supply is probably only going to handle a 20 amp output . . .reliably . . . first question will be how much is your test load with that mere 5VDC output ?
Then, we need to analyze to see if the fault is being with the initial raw DC supply or with the regulator circuitry on the side board.
The Raw dc supply is at the somewhat smaller RED wire, which I have marked with the YELLOW arrow.
The BLACK arrow is the regulator board
The PINK arrow denotes the cluster of 6 electrolytics . . .4700 motherly-farads each. . . .I believe .
. . . which are being the storage bank for the raw DC supply.
You need to meter the DC voltage being between negative terminal on the FRONT panel, as ground referencing, and the RED wire, I earlier pointed out, with the unit initially unloaded, and then confirm, what the unloaded supply initially has for being its total supply capability.
Also measure it in AC mode and record.
Then load down the supply and confirm what the raw DC voltage is then changing to, as well as what the AC voltage content, then changes into.
Come back to me with those findings, and we will then be able to see what route to take in this potentially MULTI forked path to success.
Your P.S. units . . . . . . .Selfie :
VISIBLE ADDENDA:
For Sir shrtrnd . . . .
No " exotic " adjunct sense terminal are incorporated on this unit.
ALSO . . . . there is no external current limiting control.
73's de Edd
Since that power supply is probably only going to handle a 20 amp output . . .reliably . . . first question will be how much is your test load with that mere 5VDC output ?
Then, we need to analyze to see if the fault is being with the initial raw DC supply or with the regulator circuitry on the side board.
The Raw dc supply is at the somewhat smaller RED wire, which I have marked with the YELLOW arrow.
The BLACK arrow is the regulator board
The PINK arrow denotes the cluster of 6 electrolytics . . .4700 motherly-farads each. . . .I believe .
. . . which are being the storage bank for the raw DC supply.
You need to meter the DC voltage being between negative terminal on the FRONT panel, as ground referencing, and the RED wire, I earlier pointed out, with the unit initially unloaded, and then confirm, what the unloaded supply initially has for being its total supply capability.
Also measure it in AC mode and record.
Then load down the supply and confirm what the raw DC voltage is then changing to, as well as what the AC voltage content, then changes into.
Come back to me with those findings, and we will then be able to see what route to take in this potentially MULTI forked path to success.
Your P.S. units . . . . . . .Selfie :
VISIBLE ADDENDA:
For Sir shrtrnd . . . .
No " exotic " adjunct sense terminal are incorporated on this unit.
ALSO . . . . there is no external current limiting control.
73's de Edd
Last edited:
I will try that but first I would like to mention that it starts to acted up with less then an amp load. a relay clicks and then it drops off then the voltage tries to go up then a relay clicks and the voltage goes back down then it goes all over the place with a relay clicking. This supply is not very old. I appreciate any help you can give me
Haven't looked-up the unit.
First thing I'd ask is if it has a 'sense' input. A lot of good power supplies require you to connect the 'sense' leads
to the output before it will operate. Second thing I'd look for is a defective crowbar circuit itself. The crowbar clamps-down
the output in an over-current load situation. But I've seen plenty of them fail all by themselves and result in the
problem you're seeing now.
I don't know if this is something you've been using, and it just quit. Or if you got it as a unknown from somebody
else and are trying to troubleshoot the failure it already had that you just discovered.
First thing I'd ask is if it has a 'sense' input. A lot of good power supplies require you to connect the 'sense' leads
to the output before it will operate. Second thing I'd look for is a defective crowbar circuit itself. The crowbar clamps-down
the output in an over-current load situation. But I've seen plenty of them fail all by themselves and result in the
problem you're seeing now.
I don't know if this is something you've been using, and it just quit. Or if you got it as a unknown from somebody
else and are trying to troubleshoot the failure it already had that you just discovered.
Waiting for your monitoring of the units basic power reservoir . . . .that bank of electrolytics in the initially derived raw DC power section . That tells a lot.
73's de Edd
73's de Edd
Similar threads
